Monochromatic Light Is Incident on a Diffraction Grating That Is $75 \mathrm {~mm}$

Multiple Choice

Monochromatic light is incident on a diffraction grating that is $75 \mathrm {~mm}$ wide and ruled with 50,000 lines. The second-order maximum is seen at $32.5 ^ { \circ }$ . What is the wavelength of the incident light?

A) $202 \mathrm {~nm}$
B) $806 \mathrm {~nm}$
C) $403 \mathrm {~nm}$
D) $605 \mathrm {~nm}$